Lock



E. N. JACOB! LOCK Filed April 9, 1931 2 Sheets-Sheet l llllll Il E. N. JACOBI Oct. 11, 1932.

LOCK

Filed April 9. 1951 2 Sheets-Sheet 2 /Au /m Patented Oct. 11, A1932 `*UNITED PATENT OFFICE Env/'ARD N. JACOBI, orY MILWAUKEE, WISCONSIN, AssIGNOn To BI'LIGGS & STB-ATTON CORPORATION, or MILWAUKEE, WISCONSIN, A CORPORATION orl WISCONSIN LOCK Application med Aprn 9,

rllhis invention relates to certain new and useful improvements in locks and refers more particularly to what is generally termed a removable cylinder lock of the general type illustrated in my copending application Se` v rial No. 390,737 whereinl an operating key is utilized to disable the limiting means and permit further rotation of thecylinderrto a Another object of this invention ,resides` in the provision of an improved lock of the character described wherein an assembling hood or cap member extends over the .exposed end of the lock cylinder and the outer end portion of the lockcylinder mounting head and has means for maintaining the cylinder assembled with the mounting head, the lock cylinder and the hood being readily removable fromthe mounting head with the aid of a properly designed key.` i

Another object of this invention is to provide a lock structure of the character described in which a protecting cap secured over the outer end of the lock cylinder and mounting head not only releasably retains the lock cylinder in the mounting head, but also positively holds the mounting head against disassembly from its casing or other support when the lock is in locked position.

In this connection it isa further Object of this invention to provide cooperating means carried by the mounting head, the cap, and the receiving casing or other support Which, when in predetermined relativepositions, permits the mountinghead and the entire structure carried thereby to be removed from the receiving casing. i o

A further object of this invention resides in the provision of means carriedby the re ceiving casing, the mounting head, and the cap member so disposedwith respect to each other that rotation of the lock to its unlocked with respect to its receiving casing.

1931. serialy No. 528,823.

position places the same in positions at which the release of the mounting head andthe look cylinder carried thereby may be effected.

A still further object ofthis inventionoresides in the provision of cooperating means carried by the mounting head and the receiving casing or other support which is normally engaged to preclude relative rotation of these elements and which may be disengaged when the lock cylinder is in a predetermined relative position to permit these* elements to be disengaged and thev mounting headA turned VWith the above and other ob 'ects in view which will appear as the description proceeds, my invention resides in the novel construction, combination and arrangement of parts substantially as Y hereinafter described and more particularly defined by the appended claims, it being understood that such changes inthe precise embodiment of the hereindisclosed invention may be made as come within the scope of the claims.

In the accompanyingV drawings, I have illustrated one complete example of the physical embodiment of my invention constructed Vaccording to the best mode I have so far devised for the practical application of the principles thereof, and in which o Figure 1 is a perspectiveview of a lock assembly embodying my invention, the mounting head and cylinder being removed from the outer casing or tube which is partly broken away and in section to illustrate structural details;

Figure 2 is a view partly in longitudinal section and partly in side elevation taken through the lock assembly; A

Figure 3` is a transverse, sectional view.

taken through Figure Qon the plane of the line 3 3; n o

Figure 4 is a transverse sectional view taken through Figure 2 on the plane of the line 4 4; f

Figure 5 is a top elevational view of the lock assembly with parts broken away and in section, said view being taken'on the plane of line 5 5 of Figure 4; o Figure 6 is a perspective view of the mounting head, the lock cylinder and the cap shown lock cylinder 12, which is provided with ax' plurality offconventional locking tumblers 13 yieldablyurged to extend one end into one of a pair of diametrically opposite longitudinal tumbler receiving grooves 14 formed inthe mounting headin communication with its bore 11. As is customary the tumblers 13 are adapted to be retracted entirely within the lock cylinder by a proper key 15 inserted' intova key receiving opening 16 in the cylinder to free the cylinder for rotation.

At itsouter end, the `lock cylinder has an enlarged annular {iange 17, the inner wall 18 of which abuts the outer face 19` of the mounting head and limits-longitudinal movement of the lock cylinder into tliemounting head, and outward movement of the lock cylinder is preventedby an armored cap 20 releasably secured over the outer end of the mounting headin a manner to be later described. A The cap^20 encloses the entire outer end of the lock cylinder and mounting headand being formed of hardened metal, 'formsa protecting housing therefor and resistsk destruction o'r' the lock. Y

As best shown in Figure 6, the cap 20 is an open ended substantially cup shaped struc-- ture with its bottom formed with an outwardly exten-ding central portion or depression 21, the internal diameter o-which is substantially that ofthe enlarged iange 17 on the lock cylinder to snugly receive the same and the inside diameter of the larger Vportion of the cap is such as to snugly receive the outer end 22 of the mounting head which is reduced indiameter so that the outer peripheral surface of the cap is substantially flush withv the major portion of the mounting head when these elements are assembled.

To hold the cap against removal from the mounting head, its inner open end portion is provided with a plurality o circumferentially spaced depressions or lugs 23 which are normally received in an annular channel 24 in the reducedV outer end portion 22 of the mounting head. These depressions 23 are engageable into the annular groove through a plurality of entrance grooves or recesses 25 extended across the lia-nge 26 between the outer l:face 19 of themounting head and its groove 24, the entrance recesses being Ycircumferentially arranged 1so as to align with the depression when the cap is in a predetermined relative position of rotation with respect to the mounting head.

Rotation of the cap with respect to the mounting head to align the depressions with their respective outlet grooves or recesses 25 is, however, possible only under certain conditions to be later described, and never takes place during the normal operation of the lock. Y

Asin all locks of this type, the lock cylinder has a predetermined degree of rotation and in the present instance, rotation is nor- `inally limited to 90 degrees and the limits of rotation are deiined by abutments carried by the lock cylinder outer enlarged head 17 and the adjacent portion or" the mounting ica-d. V

As best shown in Figure 6, the mounting head has a segment-like projection 27 extending outwardly from itsv outer end 19, the ends 28 and 29 of which cooperate with lock cylinder Acarried abutments to define the limits ot' rotation of the lock cylinder. It is noted that the end 28 of the segment-like projection 27 is in line with and ormsa continuation oi one wall oi one of the tumbler receiving grooves 14. j

The lock cylinder carried abutments are formed by stepping its annular flange outwardly from its rear portion as" at 30 which leaves a segment-like projection 31 which, when the cylinder is assembled with the lmounting head, is in the plane of the segment-like projection 27 so that its ends 32 and 33 are engageable with the extremities 28 and 29 of the mount-ing head projection. The lock cylinder abutment provided by the end 32 of the segment-like projection 31 is engageable with kthe extremity 29 ot the projection 27 to limit rotation of the lock cylinder from locked to unlocked posit-ion, and it is noted that when these abntments engage, the cylinder is turned 90 degrees with respect to its position illustrated in Figures 2, al, and 5, and the axis of the tumblers is aligned with a third longitudinal tumbler receiving groove 34 to permit the key to be withdrawn.

The locked position ot the lock cylinder is 'defined by the engagement of a movably j mounted locking lug 35 on the lock cylinder allel with the lock cylinder axis, in the segmental recess 37 and the resiliency of the sprin member normally maintains the locking lug in a position within the segmental rrecess 37vout of alignment with the segmentlike projection 27 on the mounting head.

The'regular key 14, however, has a shoulder 39 which engages the free endportion of the spring member as best shown in Figure 2 and moves the locking lug into the path of the mounting member abutment 28 as the key is inserted so that during normal operation, the locking lug 35 is always moved to its operative position and engages the abutment 28 to limit movement of the lock cylinder in locked position.

Thecap member 20 has a key receiving opening 40 in its outer closed end to align with the key receiving slot 16 in the lock cylinder and an instruck tang 41 on the outer closed wall of the cap-is engageable inthe key receiving Slot 16to hold the cap against relative rotation on the lock cylinder so that the cap turns with the lock cylinder. As best shown in Figure 4, in which the lock cylinder is in its locked position, the cap 2O is so located on the lock cylinder that its depressions'23 do not align with their respective outlet grooves 25 during the normal opera* tionv of the lock so that accidental detachment of the lock cylinder from; the mounting head is impossible. Alignment of the depressions 23 with their respective outlet recesses 25 takes place only when the lock cylinder and c cap are turned beyond the normal locked position oi the cylinder and to lpermit such ro tation a special key` is necessary. In this special key the shoulder 39 is either entirely omitted or is placed outward suiiiciently tar so as not to move the lockinglug 35l to its operative position,

As the special key does not move the locking lug 35 to operative position, it is thus possible to turn the lock cylinder beyond its normal locked position until the abutment 33 formed by one end ot the segmentlike projection on the lock cylinder` engages the mounting head abutment `28. Engagement of these abutments aligns the` cap member depressions 23 with their respective outlet grooves 25 and permits the cap and consequently the locking cylinder to be detached from the mounting head.

The lock structure so far described may be applied to any desired use, and in the present instance, it is shown as directlycontrolling a switch mechanism designated generally by the letter S which is mounted within an outer casing or supporting element 42. This switch struct-ure consist-sof a pair of spaced stationary contacts 43 carried by a mounting panel 44 "lined in the receiving casing 42 and a movable contactoi 45 having` contacts engageable withthe stationary contacts 43 to bridge the same. The contactor 45 is non-rotatably connected with a disc 47 of the insulating material which in turn is drivingly connected with the inner endV of the lock cylinder through a spider like driver 48 having apertures adapted to receivelugs 49 extended from the inner end of the lock cylinder. An expansive spring 50 confined between the spider like driver and the disc 47 and received in a recess 52 in the mounting head. The recess 52 opens into the annular channel 24 so that during engagement or disengagement of the tang from the recess the tang must move into the channel 24. However, when the cylinder is in its locked positionthe inner end of the cap 2O which covers the channel 24, closes the recess 52 and prevents disengagement of the tang from the recess to positively preclude disassembly of the mounting head from the casing.

`To permit the tang to be disengaged 'from its recess, the inner end of the cap 2G is partially cut awayto provide a gate 53, but thisl gate is so located as to necessitate rotation of the lock cylinder to unlocked position so that the use of a key is required to etlect disassembly. When the cylinder isin unlocked position, the cap 20vis so disposed with respect 'to the mounting head that the gate 53 aligns with the recess 52 and a longitudinal groove 54 `in the outer surface of the mounting head sothat the groove together withthe gate 53 terms in eiect a bayonet slot through which the tang 51 may be passed to permit the removal or insertion ot' the mounting head into the outer casing.

During normal operation of thelock accidental disassemblyis prevented by a screw passed through an opening in the casing and threaded into an opening 56 in the mounting head, thus when it is desired to disassemble the mechanism it is necessary to remove the screw. After removal of the screw, inward pressure is exerted on the outer end of the lock cylinder or the key, moving the entire structure assembled within the casing inwardly against the action of the spring 5() to disengage the raui l tang :trom the mounting head recess and align the same with the gate in the cap. rlhe mounting head then may be turned to align the groove 54 with the tang anu permit relaive axial movement between the mounting head and the casing. lt is noted that i much as the abutments 32 and 29 ot the lock cylinder and mounting head respectively are engaged when the lock cyiinder is in its unlocked position it is possibi/e to employ the CII ings, it Will be readily apparent to'thosel skilled in the art to Which an invention oli the character described appertains, that I provide novel means for removably securing a lool; cylinder in its mounting head and for releasably maintaining the mounting head and loch cylinder, assembled With a supporting element, and in which the means for securing the elements assembled also serves as an armor :tor the outer exposed enl of the locl structure to protect the same against destruction.

I claim: Y

l. In a lock structure including a mounting head, a lock cylinder and a supporting element in .vhich the assembled mounting head and cylinder is received, single means for removably securing the cylinder in the mounting head 'for positively preventing disassembly of themounting head from the supporting element when the lock cylinder is in locked position. Y 1 A 2. In a lock structure including a mounting head,- a loclr cylinder anda supporting .element adapted to. receive the assembled mounting head andv loclr cylinder, a protecting element secured over vthe lock cylinder and mounting head, and means whereby said protectingelement removably secures the lock cylinder inthe mount-ine head and positively precludes detachment 'of the mounting head :from the supporting element When the lock cylinder is in its locked position.

8. In a loclr structure including a mounting head, a lock cylinder and a supportingelement adapted to receive the assembled mounting head and lock cylin 1er, a single element associated with the mounting head, ioclr cylinder and supporting element and normally 4" preventing disassembly of said elements, and

means whereby movement of said element to diierent predetermined positions, which movements require the use of a key, enables the lock cylinder to be removed from the mounting head and the mounting head to be Withdrawn from its supporting element.

ll. In a locl structure including a mounting head and a l-:ey operable lock cylinder mounted therein, a protecting cap engaged over the locli cylinder and adjacent portion of the mounting head to removably retain the lock cylinder assembled with the mounting head, and means for securing` the cap in operative position, said means being disabled by movement of the locl; cylinder to a predetermined position. Y

5. In a lock structure includinga mounting head having a lock cylinder mounted therein, a protecting cap engaged over one end Jortion of the lock cvlinder and the ad- ]acent portion of themounting head for re.- leasably securing the lock cylinder in the mounting head, and means whereby movement of the lock cylinder to a predetermined position enables the cap to bedisengaged from said elements to permit the lock cylinder to be Withdrawn from the mounting head.

6. In a lock device of the character described including a mounting head and a lock cylinder mounted therein, a protecting ele- .r

ment secured over the exposed portions of the lock cylinder and mounting head to hold the lock cylinder in the mounting head, and means whereby the protecting element may be removed to permit Withdrawal of the lock cylinder from the mounting head upon movement of the lockcylinder and the protecting element to a predetermined position With respect to the mounting head by means of a key inserted into the lockl cylinder.

7. In a lock structure including a mounting'head, and a lock cylinder mounted therein, a protecting element secured over the eX- posed portion of the lock cylinder and the mounting head and releasably .engaged With the mounting head to removably secure the lock cylinder in the mounting head, said. protecting element being disengageable from'the mounting head upon movement of the protecting element to a predeterminedyposition with respect to the mounting head, and means whereby a special key is necessary to el'ect such movement.

k8. In a lock structure including a mounting head and a lock cylinder mounted therein, a protecting cap secured over the exposed end portions of the lock cylinder and mounting head, interengagingmeans carried by the protecting cap and mounting head for securing the protecting cap on the mounting head to secure the lock cylinder in the mounting head, said interengaging means being disengageable upon movement of the protecting cap to a predetermined position with respect to the mounting head, and means whereby the protecting cap may be moved to said predetermined relative position upon the insertion of a special keyinto the lock cylinder.

9. In a lock structure of the character described including a Yloelr cylinder and a mounting head, a protecting cap engaged over the exposed end portions ol the lock cylinder and mounting head, interengaging means carried by the mounting head and said protecting cap to secure the lock cylinder in the mounting head,said interengaging means being disengageable upon movement of the protecting cap to a Vpredetermined position with respect to the mounting head, and key controlled means for normally preventing movement of the cap to such position.

10. In a lock structure including a mounting head and a lock cylinder mounted therein, a protecting cap engaged over the exposed end portions of the lock cylinder and mounting head, an abutment carried by the protecting cap and engaged in a channel formed in the mounting head to secure the protecting cap against removal While permitting rotation thereof in the mounting head, said mounting head having an outlet recess communicating with the channel through which the abutment may be passed to eifect detachment of the cap from the mounting head, alignment of the cap carried abutment with the said outlet recess necessitating movement ,n

of the cap to a predetermined position with respect to the mounting head, and key controlled means for normally preventing movement of the cap to said predetermined position.

11. In a lock structure of the character described including a mounting head and lock cylinder movably mounted therein, a protecting member engaged over the exposed end of the lock cylinder and mounting head, abutments carried by the protecting cap and engaged in an annular channel in the mounting head to normally hold the cap against displacement from the mounting head and thus secure the lock cylinder in the mounting head, the mounting head having outlet recesses through which said abutments may be passed to enable the cap member to be engaged and disengaged from the mounting head, alignment of the cap member abutments with said outlet recesses necessitating movement of the cap and lock cylinder to a position beyond one of the normal limits of movement of the lock cylinder, and means whereby a special key enables movement of the lock cylinder and cap beyond said normal limit of movement to align thecap abutments with their respective outlet recesses.

12. In a lock structure of the character described including a mounting head and a supporting casing adapted to receive the mounting head, cooperating means carried by the supporting casing and the mounting head for releasably securing the mounting head in the supporting casing, said cooperating means being disengageable upon n predetermined relative motion between the supporting casing and mounting head, and a protecting cap secured over the outer .end of the mounting head and normally preventing such relative motion between the supporting casing and mounting head.

13. In a lock structure of the character described including a mounting head having a key actuated lock cylinder and a supporting casing adapted to receive the mounting head, cooperating means carried by the supporting casing and the` mounting head for releasably securing the mounting head in the supporting casing, said cooperating means being disengageable to enable withdrawal ofl the mounting heady from the receiving casing upon a predetermined relative motion between the mounting head and the supporting casing, and means movable with the key controlled lock cylinder forpreventing such movement when the lock cylinder is moved by a proper key out of its locked position.

14. In a lock structure of the character dethe supporting casing, said cooperating means being disengageable upon a predetermined movement ofthe mounting head with -respect tothe supporting casing, a protecting cap securedover the outer end of the lock cylinderA and the mounting head and movable with the lock cylinder, said protecting cap positively` preventing movement of the mounting-head with respect to the supporting casing when the lock cylinder' is in its `locked position, .and means whereby movement of the lock cylinder and the protecting cap to predetermined positions by means of a proper key releases the mounting head for movement with respect to the supporting casing to enable the cooperating means tov be. disengaged.

15. In a lock structure of the character described including a mounting head having a key operable lock cylinder and a 'supportingcasing adapted to receive the mounting head, cooperating meanscarried by the supporting casing and the mounting head for releasably securing the .mounting head Yagainst detachmentfrom the supporting casing, said cooperating means Abeing disengageable upon Y apredetermined relative motion between the supporting casing and the mounting head, and a :protecting cap connected with the mounting head to secure the lock cylinder therein, said protecting cap positively preventing relative motion between the mount-A ing head and supporting casing except whenY the lock cylinder is moved by means ofa proper key to a predetermined position.

16. In a lock structure of the character described including a mounting head member having alock cylinder movable` therein andy a supporting member adapted to receive the mounting head member, a lug carried by one ofl said members and engageable in a recess in the other for detachably securing said members assembled said lug being disengageable from said recess upon a predetermined relative movement of one member with re-Y spect to the other, and means carried by the mounting member and preventing such movement while the lock cylinder is in locked position.

17. Ina lock structure of the character described, including a mounting head member having al key operable lock cylinder mounted therein and a supporting member adapted to receive/the mounting head member, a lug carried by one member and engageable through a slotin said other member with a recess in said other member upon predetermined relative movements between said members, ,and kmeans carried by the mounting llO head member andV movable with' the n lock cylinder for closing communication between said slot and recess except when the lock cylinder is moved out of its locked positionV by means oi a key to prevent the passage of the lug to and from the recess. v

18. In a lock structure of the character de-` scribed including amounting head having a key operable lock cylinder therein and a 0 supporting casing adapted to Vreceive the mounting head,means for detachablysecuring the mounting head assembled with the supporting casing, comprising a` lug -carried by the supporting casing and engageable in a 15 recess in the mounting head, said mounting head having a ylongitudinal groove through which the lug may be passed to enable the same to be engaged with and disengaged from the mounting head recess, said groove and C. recess being circumferentially spaced whereby rotational movement of the mounting head with respect to Vthe supporting casing is necessitated to align the lug with the recess during insertion of the mounting head and to align f5 the head withl the groove during removal or" the mounting head, and a protecting cap carried by the mounting head and normally closing the recess to prevent detachment of the lug from the recess.

` ti 19. In a lock structure of the character described including a mounting head Vhaving a key operable cylinder therein and a supporting casing adapted to receive the mounting head, means for detachably securing the mounting head assembled Awith the supporting casing, comprising alug carried by the supporting casing and engageable in a recess in the mounting head, said mounting head having a longitudinal groove through which 40 the lug may be passed to enable the same to be engaged with andr disengaged from the mounting head-recess, said groove and recess being circumferentially spaced whereby rotational'movement of the mounting head with '-"1 respect to the supporting casing is necessitated to align the lug with the recess during insertion of the mounting head and to align the groove with the lug during removal of the mounting head, and a protecting cap carried by the mounting head and movable with the lock cylinder, said protecting cap normal-` ly closing the entrance to the recess and having a gate adapted to communicate the re-` l cess with the longitudinal groove upon movef` f' ment of the lock cylinder and the cap by means of a proper key to a' predetermined position. Y Y In testimony whereof, I hereunto aiix my msignature f 1 EDVARD N.JACOBI.

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